Air-shield.



No. 888,097. PATENTED MAY 19, 1908. H. KOONS.

AIR SHIELD.

APPLIOATION FILED JUNE 24, 1907.

2 SHEETS-SHEET 1.

AIR SHIELD.

APPLIOATION FILED JUNE 24, 1997.

2 SHEETS-SHEET 2.

0 t/;/// m ii M M; i H s 5 4 g v 7 I i i w U 6 L 1 $4- T1125 Mitmzsszs: Znwzutn r To allwhom 'it may imrrijn STATES PATENT. OFFICE."

JOHN H. KOONS, OF ANDERSON, INDIANA.

Ami-SHIELD.

whereby a curtain of rapidly moving air may be projected across the mouth of such an opening toprevent the heat therefrom from too greatly affecting the workmen;

My invention consists of a novel adjustable means to direct a wide, flat ,currentof air across the opening ofa furnace so that the heat issuing from such 0 ening may be prevented from injuriously a ecting persons whose duty it is to stand before it.

My invention is embodied in the construction illustrated in the accompanying drawing? in which igure 1 is a view ofa common type of gas heated furnace with my improved device secured thereto. Fig. 2 is a viewof one form I of my improved device.

- air to pass per part of the furnace from which it esca esthrough the pi e 4. The air blast for t is section of the same parallel to the front of the furnace. Fi 4 is a slightly modified construction of t e same. F1g.. 5.is a cross section of the device shown in Fig. 2 on the line 55. Fig. 6 is a cross section on the line 6-6 of Fig. 4.

Similar reference characters refer to like parts throughout the several views.

In the drawings 1 is a furnace provided with a hood 2 WlllCll rojects outwardly over the space in front of t e operating opening 3. The usual opening through the front wall near the to of the hood permits the heated om under the hood into the upfurnace is sup ied by the pipe 5 which has a branch 6 w ch connects directly to my im roved device through the connection 7.

device consists of a body portion 8 has upwardly projecting ortions 9 and is adapted to be'secured to t e front of a furnace by means of lugs 10. This body is hollow and is provided with deflectingjplatesv 11 and 12 to cause the air entering t ough the connection 7 to flow easily u and out through the side passages 13 an the long Specification of Letters Patent. Application filed June 24, 190 7. Serial No. 880,469.

Fig. 3 is a crossv Patented. May 19, 1908.

[horizontal passa e 14. The late 15 projecting forward om the b0 y carries the gate 16 secured thereto by means of bolts 17, the slotted holes in the plate permitting the opening 18 to be any width desired. The side gates 19 are secured to the forwardly projecting bars 20, and by reason of slots in these plates 19, they may be set so that the openings 21 will be of any desired width.

Under ordinary conditions anintense heat streams out of the furnace through the opening 3, through which opening the workman introduces and withdraws the article to be heated, whether it be material for for ng glass to be reheated or metal to be me te he hands of the operator, even when protected by loves, often become badly scorched an his clothing is very often ignited. When my improved device is secured to the furnace, a current of cold air passes through the pipe 6 and the connection 7, out through the flat slot 18, up across in front of the opening 3 of the furnace, carrying up with it the extremely heated air at the mouth of this opening 3, the blast being strong enough to remove the heatedair as fast as it is heated. To prevent this blast or shield of air from-becoming fan shaped and -'esca'ping into the Work-room carrying with it the heated air from the front of the opening 3, I provide means to prevent such lateral escapements. For this pur ose the portions 9 of my device are providbd with the openings 21 through which auxiliary blasts press against the edges of the shield of air and prevent it from becoming fan shaped. The amount of'blast will be regulated by the ates 16 and 19 accordin to the pressure of t e air and the heat of t e furnace. i

Some furnaces receive liquid or gaseous fuel from the front, in which case I may provide the body of my -i'mproved apparatus with a assage 23 through which thefuel may the opening 18 it may be withdrawn through the opening in the bottom. j

\Vhilemy improved device is illustrated as a box with upwardly projecting portlons 9,

the front of a furnace and provided with a circumstances may direct variatlons to fit difi'erent conditions and these changes may be readilymade by furnace designers.

- Having now explained my invention, what I claim as my invention and desire to secure by Letters Patent is,-

1. A hollow device adapted to be connected to an air pipe, and to be secured adjacent to an opening lnto a hi 'hly heated space, and having a longitudinal s 0t, and a horizontally movable gate for controlling the width of the slot.

2. A. hollow box adapted to be secured to i connection to an air pipe, upwardly extending portions formed on said box, said box having a longitudinal slot, and said auxiliar portions having vertical slots, and gates whereby the width of said slots may be varied.

In testimony wheredf I have signed this specification 1n the presence of two subscriblng witnesses.

JOHN H. KOQNS.

VYitnesses ELLIOTT LEE, -WM. F. CORSANT. 

